I've downloaded Map, Sceneryobjets and Splines. Some Splines are gone, and it seems to have been snowing in the map... Ground texture is white? I don't know what I might have been missing. Halfway line 4, complete tiles are missing. That's strange, because Omsi Map Tools tells me following info:
I would advice you to take a second computer with a clean installation of Omsi 2 and try to setup your map. That's the most easy way to know on which additions you're depending.